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If the coupling is not small, i.e., $\\lambda_W^{(\\nu*)}>1$ the mass of the excited neutrino must not be gless than the $Z$ boson mass, $m_Z$. Since $\\nu^*$ contributes in the $(\\b\\b)_{0\\nu}$ decay as a vertual state, this decay will give an oppotunity to explore the much heavier mass region of $\\nu^*$.\n In this paper, we present the decay formula of $(\\"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"hep-ph/9506379","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1995-06-21T02:03:56Z","cross_cats_sorted":[],"title_canon_sha256":"f77d5725bfdf4bde31d75c952ae3bf6ddf173ab1245cae201a40826cb9cc9803","abstract_canon_sha256":"54e3f5548947bc339873dd66ece5cae1b9d05da873248984b448e5b56bc0bfac"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:24:25.199328Z","signature_b64":"+paem8/L/byQD73ly4VMXON1vtuUTPblIlVHPflqgI+Z2pAEfbI1+AzRLEZ2A9sWtvgk4ls8h1fLniRfUuZ0Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"70ef2eeeb68af6bb44e0287a504eb9ee429d22633e39ca5e9c77be0ec0ed6e18","last_reissued_at":"2026-05-18T04:24:25.198736Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:24:25.198736Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Composite Neutrinos and Double Beta Decay","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Eiichi Takasugi","submitted_at":"1995-06-21T02:03:56Z","abstract_excerpt":"Neutrinoless double beta decay $(\\b\\b)_{0\\nu}$ occurs through the magnetic coupling of dimension five, $\\lambda_W^{(\\nu*)}/m_{\\nu*}$, among the excited electron neutrino $\\nu^*$, electron and $W$ boson if $\\nu^*$ is a massive Majorana neutrino. 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